The use of in-line selection in herds of holstein cattle

Introduction. When breeding dairy cattle to increase the genetic potential, it is important to use options for in-line selection and cross-leading lines in the breed. The aim of the study was to study the effectiveness of different selection options in dairy cattle breeding.

Оbject. The object of research was the lactating cows of the stud farm "Oroshaemoe".

Materials and methods. The data of breeding cards of cows (form 2-mol) served as the material for research.

Results and conclusions. In the herd of cattle of the Holstein breed of the stud farm "Irrigated" by monitoring the
productivity of cows, variants of intra-linear selection and line crosses have been established. Animals of various lines obtained by in-line selection are highlighted. The productive qualities of cows were studied (milk yield for the first 305 days of the highest lactation, the mass fraction of fat and protein, the amount of milk fat and milk protein for the analyzed period, live weight). The analyzed data were processed by methods of variational statistics. The analysis found that under the same conditions of feeding and keeping, animals of different lines of the Holstein breed, obtained by intra-linear selection, of the three leading lines of the breed – Vis Ideal, Reflection Sovering and Montvik Chieftain, have different indicators of the productivity of the selected traits. It has been established that the highest yields are characterized by animals obtained by inline selection in the Montvik Chieftain 95679 line. Animals of this line outperform cows from other lines in milk yield by 223.1-589.0 kg, or by 6.3-6.7 %. In terms of the amount of milk fat for 305 days of lactation, the superiority is 8.1-18.0 kg, or 2.8-6.3 %. Animals of this intraline selection produced milk protein more than cows of other lines by 11.4-20.8 kg. The article presents data on the live weight of animals of the three leading lines of the Holstein cattle breed.

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